McDonald and his colleagues lay out several interrelated ideas in what they call a theory of action space. Frequently education policy gets so ambitious that implementing it becomes a near impossibility. Action space, however, is what takes shape when talented educators, leaders, and reformers guide the social capital of civic leaders and the financial capital of governments, foundations, corporations, and other backers toward true results. Exploring these extraordinary collaborations through their lifespans and their influences on future efforts, the authors provide political hope-that reform efforts can work, and that our schools can be made better.